Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca24fc2d9f73f799…

MALICIOUS

PDF

47.4 KB Created: 2020-08-13 21:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa946e71cb428a8ff3c29b6f8d2851e SHA-1: 350867b2459ca00c5ff1c560caa79dd956dba352 SHA-256: ca24fc2d9f73f799713a15fb5f52adc6e4df85ac7b6d39c788912dac90ec6db8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.cc). This suggests an attempt to obscure the final malicious destination, likely a phishing page or malware download. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=broadsheet+sydney+restaurants+cbd
    • http://files.thehivepto.com/uploads/1/3/0/7/130775516/6772745.pdf
    • http://labej.namastebrown.com/uploads/1/3/0/9/130969723/nukuzira_muretewusav.pdf
    • http://xitemazur.theaterfreunde-siders.ch/uploads/1/3/0/8/130814328/760692.pdf
    • http://files.laverocklawcottages.com/uploads/1/3/0/8/130814868/boxeku_vixofasabiri_fejozosibakolov_gimapegepad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1912/4382/files/55093784611.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49090326843.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0424/files/wumipure.pdf
    • https://cdn.shopify.com/s/files/1/0435/5856/8097/files/retujadajelexebirideju.pdf
    • https://cdn.shopify.com/s/files/1/0433/2748/8168/files/19035096766.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/furuzefebofezinadofijezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/wawilovo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/wetherspoons_menu_nutrition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/fukew.pdf
    • https://cdn.shopify.com/s/files/1/0437/9056/5537/files/causes_of_neonatal_sepsis.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/yksek_gerilim_teknii_birsen_yaynevi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1898/3323/files/government_accounting_101.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/tisarataletarijasu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/definition_of_training_program.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a92.bin
f1b02482b38449c1a875b57ce97b4c55001f6a88fb52c5918f930f051b3d5cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A92 5288 bytes
font_01_sfnt_off00008c85.bin
7e4c312f997572e49ad7ea5498973e75facab442d2a8da7b2c2fd058b7672e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C85 10832 bytes

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